The circulatory (cardiovascular) system for humans include: heart, blood, arteries and blood vessels. The heart pumps the blood through the arteries and then throughout the body by then using blood vessels.
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Answer:
first blank: exocytosis
Second blank: Membrane-Bound vesicles
Explanation:
The brain and the skull the skull protects the brain
Individuals who are heterozygous for the sickle-cell allele suffer less from the attack of malaria because a small percentage of the red blood cells are sickle-shaped. They are more resistant to malaria than individuals who have two copies of the normal haemoglobin allele. Heterozygous individuals have a better chance of surviving and reproducing in regions where malaria is prevalent since they do not fully contract the disease.